1. Tardigrade
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  3. Chemistry
  4. The energy of an electron in first Bohr orbit of H - atom is - 13.6 eV. The energy value of electron in the excited state of Li2+ is :

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Q. The energy of an electron in first Bohr orbit of $H$ - atom is $- 13.6\, eV$. The energy value of electron in the excited state of $Li^{2+}$ is :

JEE MainJEE Main 2014Structure of Atom

Solution:

Energy of $e^{-} $ in the excited state of $ Li^{+2}$

$E=-13.6 \frac{Z^{2}}{n^{2}}$

$=-13.6\times\frac{\left(3\right)^{2}}{\left(2\right)^{2}} e V$

$=-\frac{9}{4} \times13.6 \,eV$

$=-30.6\, e N$